Quasi-Phase-Matching Efficiency Optimization for Coupled Second-Order Nonlinear Processes

2019 ◽  
Vol 31 (21) ◽  
pp. 1721-1724
Author(s):  
Cheng-Wei Hsu ◽  
Jui-Yu Lai ◽  
Shang-Da Yang
Keyword(s):  
Second Order ◽  
Phase Matching ◽  
Nonlinear Processes ◽  
Efficiency Optimization ◽  
Quasi Phase Matching ◽  
Matching Efficiency

ENHANCING CONVERSION EFFICIENCY IN THE SECOND-ORDER NONLINEAR OPTICAL PHENOMENA

2004 ◽  
Vol 13 (03n04) ◽  
pp. 445-449
Author(s):  
JONGBAE KIM ◽  
JUNG JIN JU ◽  
MIN-SU KIM
Keyword(s):  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Quasi Phase Matching ◽  
Optical Phenomena ◽  
Nonlinear Optical Phenomena ◽  
Second Order Nonlinearity

The distributions of electric field and the induced second-order nonlinearity are discussed in a poling scheme where the width of a periodic electrode is shorter than the conventional coherent length. The theoretical aspects of quasi-phase matching for a subsequent experiment in second harmonic generation are analyzed. The present analysis consistently explains that the conversion efficiency can be enhanced if the electrode width is shortened, and maximized if the electrode width is optimized.

Moving media: Second harmonic generation investigation

2016 ◽  
Vol 30 (22) ◽  
pp. 1650138
Author(s):  
Mahboubeh Ghalandari
Keyword(s):  
Electric Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Nonlinear Media ◽  
Quasi Phase Matching ◽  
Moving Media ◽  
Order Susceptibility

Because of the importance of second harmonic generation (SHG) in some nonlinear media, in this paper, we investigated induced SHG in diamond where there is no intrinsic second-order susceptibility, [Formula: see text]. The electric field is proposed to introduce moving susceptibility of the second-order and induce second harmonic generation. Then, spatiotemporal quasi-phase matching (QPM) is applied to optimize the induced SHG. Numerical results reveal that in this way, the induced second harmonic is found at the frequency of [Formula: see text] rather than [Formula: see text].

Theoretical Analysis of Efficient Terahertz Difference Frequency Generation in Periodically-Inverted GaAs Crystals

2014 ◽  
Vol 1015 ◽  
pp. 264-267
Author(s):  
Zhi Ming Rao ◽  
Fang Sen Xie ◽  
Zhi Fang He
Keyword(s):  
Difference Frequency Generation ◽  
Uniaxial Crystal ◽  
Second Order ◽  
Difference Frequency ◽  
Nonlinear Susceptibility ◽  
Phase Matching ◽  
High Power Conversion Efficiency ◽  
Thz Wave ◽  
Quasi Phase Matching ◽  
Frequency Generation

This paper reports the analysis of efficient terahertz (THz) wave generation on the basis of quasi phase matching (QPM) difference frequency generation (DFG) in periodical GaAs by CO2laser. The efficient second-order nonlinear susceptibility of GaAs was calculated by similar to the calculation it of uniaxial crystal. We calculated second-order nonlinear susceptibility for the incidence two pump lights with the same propagation directions. The result shown that, the incidence two pump lights with the perpendicular polarization directions and the same polarization directions were efficient to obtain high power conversion efficiency of THz wave.

scholarly journals Femtosecond Cascaded Second-Order Nonlinearities in Quasi-Phase-Matching Devices

2004 ◽  
Vol 32 (3) ◽  
pp. 170-174
Author(s):  
Satoshi ASHIHARA ◽  
Tsutomu SHIMURA ◽  
Kazuo KURODA
Keyword(s):  
Second Order ◽  
Phase Matching ◽  
Quasi Phase Matching

scholarly journals Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry

2020 ◽  
Vol 10 (24) ◽  
pp. 9047
Author(s):  
Pierre Guillemé ◽  
Chiara Vecchi ◽  
Claudio Castellan ◽  
Stefano Signorini ◽  
Mher Ghulinyan ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Matching Condition ◽  
Second Order ◽  
Phase Matching ◽  
Zinc Blend ◽  
Quasi Phase Matching ◽  
Fabrication Defects ◽  
Phase Matching Condition

Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility χzxy(2)≠0. We found the best compromises between performances and experimental requirements, and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easily transferred to other material systems.

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